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Old 11-20-2008, 11:40 PM   #1
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Oil

Any thoughts about which oil to use? Do you think that synthetic is the way to go?

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Old 11-20-2008, 11:51 PM   #2
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Quote:
Originally Posted by Baja777 View Post
Any thoughts about which oil to use? Do you think that synthetic is the way to go?
YES- Synthetic oil like mobil one will last 15 thousand between oil changes. That is as far as I would test the limits. This was on my mustang. In that 15k oil change I did 2 road race events then visit the drag strip another 3 or 4. I had my oil analyzed and they said I have about 5k left in it. I run all the vehicles at the house to round 10k between changes.

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Old 11-21-2008, 09:02 AM   #3
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Asking this question on a gearhead forum is like going to a PTA meeting and asking which kid is the cutest/smartest/most talented....

Mobil-1 for me, every 6K miles.
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Old 11-21-2008, 02:06 PM   #4
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yea mobil one is the only way to go. thats what i put im my srt4 and it loves it.
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Old 11-21-2008, 04:24 PM   #5
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I have used Mobil 1 or Castrol Syntec, ever 10k on all my 4 wheeled vehicles for years. Same oil every 8k on my motorcycles.
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Old 11-21-2008, 04:46 PM   #6
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Just changed my TJ (purchased used) over to synthetic (Amsoil). The 2.5 gallon will do two changes. Not a terrible price. Got synthetic for the trans, transfer case, and both diffs delivered at he same time and used discount.

AMSOIL - 100% Synthetic 10W-30 Motor Oil (ATM)
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Old 11-22-2008, 01:15 PM   #7
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I have been using Mobil 1 on my Honda forever. I will also start using it in my Jeep...I just haven't owned it long enough to change the oil yet.
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Old 01-28-2009, 02:14 PM   #8
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I hear you guys saying that you run mobil1 for 5 to 10k miles between changes. Aren't you worried about voiding the lifetime powertrain warranty? I remember signing a contact that stated I will change my oil every 3000 miles.
It's funny how I wasn't given a copy of that paper.

I agree with using mobil 1, i've used it in every vehicle I have owned with no problems.
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Old 01-31-2009, 04:57 PM   #9
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I hear you guys saying that you run mobil1 for 5 to 10k miles between changes. Aren't you worried about voiding the lifetime powertrain warranty? I remember signing a contact that stated I will change my oil every 3000 miles.
It's funny how I wasn't given a copy of that paper.

I agree with using mobil 1, i've used it in every vehicle I have owned with no problems.
The factory requirement is every 6k. I do my own oil changes. As long as I have one receipt for oil and filter for every 6K on the Jeep, they will have to find a different reason to void the warranty.
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Old 01-31-2009, 11:29 PM   #10
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Motorcycles are not supposed to use the SM type automotive oil ... they're supposed to use the SJ type of oil due to the possibility of clutch slippage when using the SM. However, the Mobil One oil is certified for both SJ and SM which is pretty nifty and is unusual for an automotive oil.

I see most of you solidly believe in synthetics but I'd offer a different take on it. My Corvette Z06 comes with synthetic oil from the factory because those cars often see extended high temps on track days and need the extra protection for high temp operations. However, most vehicles don't come from the factory with synthetic and as such I believe the benefit and extra cost of synthetics for vehicles like Jeeps and such is usually a waste of $$ and overkill. Manufacturers usually know what is best for their engines. But it does make us feel better to spend the extra money even if the advantages really don't add up to the particular application. If your Jeep is running a lot near redline with oil temps around 250* then I'd say use synthetics, otherwise it's probably not worth it, though there is certainly no harm in doing so.

Just my humble opinion.
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Old 02-01-2009, 02:08 PM   #11
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Mobil 1 or Castrol Syntech here. Tried a Mobil 1 filter once and had lifter chatter when starting. Went back to Mopar filters.
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Old 02-01-2009, 04:40 PM   #12
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Motorcycles are not supposed to use the SM type automotive oil ... they're supposed to use the SJ type of oil due to the possibility of clutch slippage when using the SM. However, the Mobil One oil is certified for both SJ and SM which is pretty nifty and is unusual for an automotive oil.

I see most of you solidly believe in synthetics but I'd offer a different take on it. My Corvette Z06 comes with synthetic oil from the factory because those cars often see extended high temps on track days and need the extra protection for high temp operations. However, most vehicles don't come from the factory with synthetic and as such I believe the benefit and extra cost of synthetics for vehicles like Jeeps and such is usually a waste of $$ and overkill. Manufacturers usually know what is best for their engines. But it does make us feel better to spend the extra money even if the advantages really don't add up to the particular application. If your Jeep is running a lot near redline with oil temps around 250* then I'd say use synthetics, otherwise it's probably not worth it, though there is certainly no harm in doing so.

Just my humble opinion.
If you don't do extended change interval, yes synth is a waste of money as any good conventional oil will protect about the same as synth for its first 6 to 8 thousand miles. Tests have shown that synthetics will protect for around 12 thousand miles. Obviously if you are racing, running constant high RPMs, or have an air cooled motorcycle in the South the oils will break down faster.

As far as motorcycles and SM and SJ. Both of those are "Energy Conserving" oils and should not be used in wet clutches. Which means they would be OK in Harleys or Guzzis with dry clutches.

For wet clutches it should be SF or SG,, the easiest way to determine is to look in the API circle on the back of the container, if it does not say "Energy Conserving" it is OK for wet clutches.

I actually use Castrol Syntec, or Mobil 1 motorcycle specific oils in my current bike.
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Old 02-01-2009, 06:27 PM   #13
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hig4s, I've had to go back and check my notes on this and it gets confusing with all the SAE ratings. But, of my 4 motorcycles, my 2 newest ones are 2006 Yamahas with wet clutches and Yamaha specifies the SJ type oil. They also list the earlier SAEs SF SG and SH as permitted, but I believe SJ is newer than those and is also recommended in the manuals.

SM rating came out in Nov 2004 for the 2005 model cars. I have it in my Oil Notes that SM is not recommended for motorcycles with wet clutches but I didn't reference the link in my notes so I can't find it right now. But Yamaha does not list that as an approved oil for these 2 air cooled wet clutch motorcycle engines that I have.

Gets confusing, doesn't it? ?

As for syns in Jeeps, most manufacturers still receommend the regular oil interval changes regardless of syn or not. I haven't checked my 2 Jeep manuals, however.

The 2 Corvettes in my garage (2005 and 2007) came with Mobil 1 in them and the onboard computers never let me go beyond 10,000 miles before the "Change Oil" light comes on and the Z06 is usually somewhere around 6,000 or 7,000 miles.
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Old 02-01-2009, 07:55 PM   #14
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hig4s, I've had to go back and check my notes on this and it gets confusing with all the SAE ratings. But, of my 4 motorcycles, my 2 newest ones are 2006 Yamahas with wet clutches and Yamaha specifies the SJ type oil. They also list the earlier SAEs SF SG and SH as permitted, but I believe SJ is newer than those and is also recommended in the manuals.

SM rating came out in Nov 2004 for the 2005 model cars. I have it in my Oil Notes that SM is not recommended for motorcycles with wet clutches but I didn't reference the link in my notes so I can't find it right now. But Yamaha does not list that as an approved oil for these 2 air cooled wet clutch motorcycle engines that I have.

Gets confusing, doesn't it? ?

As for syns in Jeeps, most manufacturers still receommend the regular oil interval changes regardless of syn or not. I haven't checked my 2 Jeep manuals, however.

The 2 Corvettes in my garage (2005 and 2007) came with Mobil 1 in them and the onboard computers never let me go beyond 10,000 miles before the "Change Oil" light comes on and the Z06 is usually somewhere around 6,000 or 7,000 miles.
The manual for my 07 Yamaha says use SG or higher, but if you go to API they list SG as obsolete, and they list all SJ types as energy conserving. Mobil 1 motorcycle oil is SG.

I have also found that while all SJ oils are considered energy conserving, not all are so slippery to show the energy conserving rating on the bottle, so those should be OK in a wet clutch.

here is the subject discussed on Bob the oil guy's forum. SJ and higher motorcycle oil. - Bob Is The Oil Guy
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Old 02-01-2009, 08:12 PM   #15
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The manual for my 07 Yamaha says use SG or higher, but if you go to API they list SG as obsolete, and they list all SJ types as energy conserving. Mobil 1 motorcycle oil is SG.

I have also found that while all SJ oils are considered energy conserving, not all are so slippery to show the energy conserving rating on the bottle, so those should be OK in a wet clutch.

here is the subject discussed on Bob the oil guy's forum. SJ and higher motorcycle oil. - Bob Is The Oil Guy
hig4s, I agree with all of that. These dang SAEs keep changing so much it's hard to keep up with it all, isn't it?

Regarding extended use of synthetics in Jeeps beyond the 6,000 mile recommended interval change in the manuals ... that makes me pretty nervous. The reason being the issue of warranty. In view of these incredible "Lifetime" powertrain warranties, if we have a warranty claim that might be related to oil issues then those of use who change our own oil had better have good documentation that we have been changing oil per the Jeep Manual recommendations. I'm uneasy about trying to convince Chrysler & Jeep that some study on the internet showed that we could extend out change intervals beyond what the manufacturer recommends because we were using synthetics. In cases like this, the Bible is the Jeep Manual. If it says 6,000 miles and doesn't specifically allow for exceptions due to synthetics then we'd better abide by it or be prepared for a possible warranty denial.

I'm sure this scenario is a remote one but still is a slight possibilty.

Back to the Superbowl ......

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