What is the best type of engine oil to use in a 94 jeep grand cherokee?

Question

synthethic or regular?
brand?

Answer 1

I would stick with conventional oil, sure synthetic it technically better. but its drawback is since it flows better, it is also more prone to leak faster,even burn faster. If you have over 100,000 miles i wouldn't bother changing now. If its driven regularly. If your engine faces extreme conditions then change,, like if you live in Alaska the better flow properties of synthetic will do you good. (example try pouring a bottle of 20-50w at 20F and see which one pours faster , synthetic will begin circulating much more efficiently) Or if you have bad habit of forgetting to change your oil, synthetic holds its properties much longer then conventional.. brands do make a difference but if you are a normal driver you wont notice any differences. Some oils have more detergents and will get dirtier sooner cleaning whatever junk could be in your old engine. I personally stay away from any Pennsylvania Grade oil Penzsoil Quaker State, These are the only brands i have ever heard bad things about. Every old mechanic has a story about how Pennzoil used to sludge up and engine.. THis was like 15 or 20 years ago, I am sure they have had formula changes... Back in my street racing days and my oil burning junkyard AMC 360 i preferred valvoline,havoline, trop artic over Castrol GTX just because it seamed to keep my lifters/rockers quieter at high rpm. and burn less too.. I would be more concerned with what weight you are using over conv/synthetic..

hope u enjoyed my babble
good luck

Answer 2

Don't bother with synthetic. It's a waste of money, unless you are running a high performance custom engine. I believe your vehicle calls for 5W-30 in low temps and 10W-30 in normal summer temps. Check your manual.

Frankly, brand is irrelevant, as long as the specification digits match or exceed that which is specified for your car. My '95 GC is approaching 200,000 miles, and I buy whatever oil is on sale, change it myself along with the filter every 5,000 miles, and the engine purrs like new and uses no oil.