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Old 11-28-2007, 09:18 PM   #1
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oil preference

1990 4.2 with approx 90k miles. What is the preferred oil weight ? ( 5w 30, 10w 30 ) Synthetic, non synthetic, high mileage additives ? No idea what was in it prior. Thanks

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Old 11-28-2007, 11:14 PM   #2
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I use 10w 30 in mine. dont use penzoil. 4 motors have burned a ton of oil with it. switched to a different oil (shell) and they didnt burn a drop.

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Old 11-30-2007, 04:27 PM   #3
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I'm using 10w30 also. I just thought someone would have a slant on higher mileage engines using synthetics or noticable improvement additives. Thanks.
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Old 11-30-2007, 06:50 PM   #4
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I have always heard that switching to synthetic can cause your motor to leak where it never did before. Plus if you dont like it, it will be a pain switching back to conventional oil due to having to flush the motor to get out all the synthetic.
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Old 11-30-2007, 08:49 PM   #5
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Quote:
Originally Posted by tjj_440 View Post
I have always heard that switching to synthetic can cause your motor to leak where it never did before. Plus if you dont like it, it will be a pain switching back to conventional oil due to having to flush the motor to get out all the synthetic.
Only if you switch to synthetic with a high milage engine.
Synthetic oil has detergent in it and it cleans your engine....if it is a high milaged engine the sludge in the engine is whats keeping you engine from leaking oil....the synthetic oil cleans the sludge around your seals and they begin to leak.

Changing back to non synthetic oil does not require any flushing.

What do you think Synthetic blend oil is?
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