Question about 1988 Jeep Wrangler
Any good quality name brand 10w/30 or 20w/40 oil will be fine in your engine. Even in an engine that old, I use a good synthetic. Generally they give better protection and thermal stability than conventional oil as well as having a longer life-span. (google: noyac volatility tests) for good information on this. The only time I would refrain from using a synthetic is if the engine has a bad oil leak. Synthetics are expensive and if it is leaking out, it can cost too much to keep it topped off. If your engine is relatively leak free, a good synthetic can actually reduce your oil consumption as most tend to soften age hardened seals and will also dissolve carbon deposits in the piston ring-lands, freeing binding rings.
One thing to keep in mind is that you need to pay attention to the micron rating of the filter you use. (smaller is better). Regardless of oil type, contamination due to poor filtration can turn any lubricant into "liquid sandpaper" on a microscopic level.
Posted on Dec 12, 2009
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Posted on Jan 02, 2017
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