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I have little tolerances for thick oil and buy XW20 or thinner on big clearances. Ali

My experience is that the sump temperatures in my high powered cars and trucks is much lower. My highest power car, with 800 BHP runs at 80c around town with spirited use, less at 80 MPH on the highway. Maybe it is because I always run thinner engine oils that have less internal friction. Ali

Real, on the road automotive engine tests I have presented in the past are revealing. Modern, fully formulated oils having a HTHS of 2.6 when put into service show no more wear than a 30 or 40 grade oil in engines designed for that viscosity range. Even with mild degradation from fuel dilution...

Lubrication, Tribology & Motorsport R.I. Taylor, Shell Global Solutions (UK), Cheshire Innovation Park, PO Box 1, Chester, CH1 3SH, UK Data showing increased power loss in F1 engines related to thicker viscosity oils:

Higher oil pressure results in more parasitic BHP losses. Ali

If you, the original poster, are looking to clean out an old engine, OVERKILL gave you the answer. Use a high ester based oil. Ali

Thinner oils can perform well especially when their film strength is higher. It was shown to me that film strength is like graphite or a deck of cards spread on a table. You can slide things around on these layers with almost infinite "thinness". Viscosity is a separate entity that has no...

The above is in contrast to the data in this paper and others: Lubrication, Tribology & Motorsport, R.I. Taylor Shell Global Solutions (UK), Cheshire Innovation Park, PO Box 1, Chester, CH1 3SH, UK Where frictional losses decrease with lowering viscosities and BHP increases with lowering...

'Interesting that the "Thick oil" people are not all over this. ...Stating that the UOA is useless to be able to say the wear is normal and that your engine is really falling apart because the MOFT is not sufficient. And demanding at least a picture of your oil filter pleats showing chunks of...

Spec oil is a 30 grade. In general I tend to use a thinner grade than specified by the manufactures, one or two or three or four grades below the recommended. Ali

This is the oil used: And no make up oil was needed. The oil level is exactly the same for these 3,000 miles. Ali

This is 90 percent in town driving, 10 percent highway. Vehicle: 2019 Lincoln Navigator L Black Label Engine: 3.5L Ecoboost High Output 450 HP End of experiments for this truck. I will stick with the 0W-20 for now as I have a stash. I think it might be good to change the air filter at this...

WalMart got smart. You can have 10 different products to sell. The thought is to have 10 times wider shelf space. Now WalMart charges for the amount of shelf space you can use for your brand. Your brand can put what they want on that amount of real estate. Now the brands only have a few...

I have been doing some investigation on Base Number and Acid Number. Some say that when the AN is higher than the BN then it is time to change the oil even if other indicators are OK. Another view is that when the AN of the virgin oil doubles it is time to change the oil. Elevated AN is an...

Use a 60 grade oil, after all, it will have the least wear as it will have the highest MOFT. Your engine will last considerably longer. Now if fuel economy is a concern you can use a 15W-40. But you will be giving up a considerable amount of engine life. This grade and any thinner grades are...

Someplace I saw a virgin oil analysis of the PZ 0W-20 that showed a moly of 53. Since the UOA sample was almost 250 most of it was left over from the run of the Red Line oil left in the engine after it was drained out.

Let me clarify: Rounded off for ease - at 29,000 vehicle miles the previous Motorcraft 5W-30 (6k run) was removed and the Red Line 0W-5 oil was put into the engine. No UOA of the Motorcraft oil was performed at this time. The Red Line 0W-5 oil was only run for 1,000 miles and removed from the...

This is a different test. When the oil was changed from the Red Line 0W-5 oil (RL’s label, not mine) there were elevated wear numbers (not shown is a UOA of the 20 grade PZ from the 1,600mi mid-sample so as not to confuse the purpose here). Were the elevated numbers real or partly left over from...

To my knowledge, the oil company must pay the API $5,500 per year and a per gallon sold fee in order to put the API label on that container of oil. The API does not test the oil to meet the dozens of test parameters required of say an SN oil. I would guess the same is true of every other...

"There is also the aspect of doing a short UOA at only 1000 miles being skewed by the left over oil from the last oil run. Depends on how much old oil is left inside the engine to mix with the new. What he should do is get a UOA on the new oil fill within a short interval, like 25 miles or less...