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oil changes: synthetic vs reg oil
Since I'm new to this diesel arena, I have a question about the duration of oil between changes.
1. how many miles between changing synthetic oil?
2. How many miles between changeing conventional oil?
I've been told by a reputable diesel mechanic, that syn lasts 20,000 miles. I"ve always changes my conv. oils at 3-5000 mile intervals. I always change out the filter at the same time.
I changed the conv. oil with Mobil 1 syn. last fall, and have about 7000 miles on it now. If I change it I'm switching back to conv. oil just because of the cost factor. Too damn expensive to run syn. I figure on runnin syn in the winter, since it was discussed on here that syn is better for winter start ups.
What's your opinion?