Thread: Detergent oil
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Old 08-12-2017, 09:29 PM   #38
Railcarmover
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Join Date: Apr 2017
Location: Sacramento
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Default Re: Detergent oil

Quote:
Originally Posted by 40 Deluxe View Post
During my 27+ years as a mechanic for Arizona Hiway Dept. we saw the opposite. We ran 15W-40 diesel oil in everything for many years to reduce inventory. When we were thinking of extending oil changes from 5,000 miles to 7,500 miles in cars and pickups, we did a lot of oil sampling. The oil in 350 Chevy pickups would often start to thicken after 5,000 miles if used hard. Seems like some samples came back as 50W!
Interesting..my experience with viscosity modifiers comes with higher soot numbers during analysis,acid build up and a subsequent drop in viscosity signaled breakdown..oil looked like black water..not arguing your findings,its entirely possible to fail 'up' the chain..my history is almost 100% diesel.
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