Quote:
Originally Posted by Gurkha
Funny part is that in every UOA done, oils like Delo 400 and Mobil Delvac Super match UOAs of synthetics pound for pound even with extended OCI. Its only when temps go down real low that good synthetic HDEO like Delvac 1 or Delo synthetic show their mettle. Otherwise for general conditions, Delo 400 or Delvac Super would do excellent. I have run diesels on these two and my engines have gone trouble free for miles.
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I agree. My wife's '96 E300D (W210, OM606NA) gets driven to snow country every winter so it uses Mobil 1 5W-40 synthetic. Because the car gets driven regularly but only about 8,000 miles a year total, I change oil and filter once a year, on the anniversary of purchase.
The three POs of the '96 all used dino oils, changed at dealer intervals (7500 miles, I think) for the car's first 250,000 miles in Oregon and northern California (no snow). That must have been OK, the car's oil tests come back showing no problems and the engine consumes and leaks no oil between the annual oil changes (the car is now at 262,000 miles).
OTOH, the '85 and '87 run on Delo-400 because they are not allowed to play in the snow. I put Mobil 1 in the '85 the first year we had it because we drove it to Salt Lake that first diesel winter but the next oil change I went back to the Chevron oil.
Jeremy
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"Buster" in the '95
Our all-Diesel family
1996 E300D (W210) . .338,000 miles
Wife's car
2005 E320 CDI . . 113,000 miles
My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970