Jerry called Pennzoil a year or two ago and had asked them about it if I recall correctly it was Jerry. they told him there was a difference and even gave the different SKU#'s ...
Any suggestions on what type of oil to use on a 97 Wrangler with 205k miles?
- Thread starter JeepWheelman71
- Start date
@Jerry Bransford ? Additional information? I was informed that the high mileage oils have synthetic additives that are the properties that help our seals and gaskets last longer. I going by information from an oil rep at a car event at least 5 years ago(time?)I’ve been running this high mileage product since with excellent results.
I believe it was, but went back and looked for that thread but couldn't find it. maybe he'll jump in and clarify this....
OP
I have been on a few Law Enforcement / 2A sites and there is no comparison to what this community has offered me by way of advice on what to do with my MidLife Crisis ride (as my wife calls it). What a Blessing you all have provided to someone who will now make fewer mistakes and save money in the process.
People began using/recommending diesel oil back when the gov mandated ZDDP level to be dropped, and some still recommend it because they don't know what they're talking about. For a few years, oil for diesel engines was exempt from the new mandates and maintained ZDDP levels in the 1200-1600 range, which is what old flat tappet engines were designed with. Diesel oil today has a lower ZDDP level, similar to a gas oil, but oil formulated for a diesel engine has more calcium (detergent), too much for a gas engine, and not the proper blend of antifoaming agents for the RPMs that a gas engine typically sees, which is often double that of a diesel engine.
Simply put, oil blended for a gas engine should be used in a gas engine. Oil blended for a diesel engine should be used in a diesel engine.
Quaker State make a full conventional "All Mileage" oil in a 10W-30 and a 10W-40 both sold at Walmart.
Most of the "conventional" oils now are basically synthetic blends. I remember back when I was using regular ol' Pennzoil 10w30 in the yellow bottle the folks at BITOG website said it was essentially a synthetic blend, and that was a few years ago back when I had an XJ.
Many use diesel oil now (HDEO) in power equipment as it holds up well. Many diesel oils also now carry a gasoline rating like API SN, so they are perfectly fine to use in a gas engine. The only thing that might happen is a slight mpg hit.
The main reason like you said that people recommended them was the higher ZDDP because the 4.0L has a flat tappet cam. What many people incorrectly assumed is that the 4.0L actually needed more ZDDP. Unless you are breaking in a new camshaft or running an aggressive cam, the engine doesn't need high ZDDP. The stock 4.0L valve spring pressures are very low, so it isn't needed.
Any suggestions on what type of oil to use on a 97 Wrangler with 205k miles?
Motor oil works best, but I use the recommended 710 fluid.Don’t worry about conventional vs synthetic. Doesn’t matter. But, DO use a high mileage oil in whatever brand you like.
I prefer 5W30 weight oils.
I prefer 5W30 weight oils.