I've noticed a knocking sound coming from motor 2 days ago. It's mostly when the Jeep is started up in the morning and it lasts until I'm half way to work (10 miles into my commute) then it goes away like nothing happened.
I checked my oil yesterday and it was below the (need to fill) line. I changed my oil a month ago and made sure I added enough. I've noticed a small spot when I park, but nothing that should have drained it that much. I added oil yesterday, but the noise persisted today.
If I drive for a while and then shut it off, and start it up again in about 20 min it knocks for about 5 seconds and then goes away. Check engine light has not come on at all, oil pressure ranges from 10-50 psi while driving, steady at 40 on highway. Anybody have any suggestions...
Almost sounds like the radiator isn't bolted in all the way and once it heats and expands stop's knocking around. Is the knock internal to the engine or are you feeling it as much as hearing it?
__________________ But the wisdom that is from above is first pure, then peaceable, gentle, and easy to be intreated, full of mercy and good fruits, without partiality, and without hypocrisy. James 3:17 (KJV)
I'm thinking maybe the oil in there is to thick. Running on 10-40 mine will tick loudly until warm. Running on 5-30 it hardly ever ticks because the oil gets to the top end faster.
This will also happen if you use any oil treatments like STP or lucas. They'll thicken the oil, thicker oil can't get to the top as fast. Once warm, oil thins out and your knock goes away.
Start by draining out all your oil, fill it with 5w30 and do not use any oil treatments. If it still knocks, you might need to run it a couple days and then change the oil again.
What oil was used when you just had it changed? 10w40? 5w30???? The higher the number the thicker the oil. As in, 10w40= 10 hot and 40 cold. 5w30 is 5 hot and 30 cold, a little bit thinner of an oil.
I started to notice this because mine would only tick for about a week right after every oil change until it thinned out a bit... with thinner oil, it will not tick even after my oil changes.
I think you know what you meant, but typed it wrong. The first number is the cold viscosity, ( Hence the W by it for Winter ) the second number in a multi-viscosity oil is the hot viscosity. So, 5w-30 is a 5 weight cold (pumps easier) and a 30 warm (protects better).
I started noticing that my 4.0's knocking/tapping sound got considerably louder after I changed my oil last. I used 10w30, but I did put a quart of lucas oil additive in it, and I am now starting to wonder if that is my problem. It does make since, because the sound begins to fade as mine warms up too. I guess I am going to change my oil out and see if it makes any difference.
Is there any downside to running 5w30 instead of 10w30 in warmer climates?