Quote:
Originally Posted by marco5
Never change your oil, even synthetic, at 7500 miles in a 30+ year old diesel. Use quality dyno/synethetic 15w40 and change every 3k miles. When the car was brand new in 1980's, and the engine was new, it was okay to follow this recommended service interval 5000miles+. These engines are decades old and have hundred's of thousands of miles on them.
Doing an oil change is the most inexpensive maintenance item you can do, do it early, use quality parts, and have peace of mind.
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And chemistry has come light years. If these engines gained their reputation for longevity on 70's dino oils @ 5K intervals, there's no reason an interval close to that with today's oils won't keep a healthy engine together just as well.
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'82 300CD
"Pearl", the very first turbo diesel 123 coupe
Totaled 11/23/18, rebuild in progress.
'85 300TD, "Artemis".
'78 300D euro, "Ol' Red", mostly retired.
'85 300D, "Gandalf".
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