Quote:
Originally posted by HarryM
Synthetic oil is about 4 times the price of mineral oil. For that price it has to be 4 times better, but is it? If you use mineral oil and change it twice as often, you're still money ahead. I'm voting for Castrol 10W40.
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Here's my experience with Mobil 1, various weights in gas engines:
1981 Chev. Citation 2.8l V6
Owned from 1984-1994, put 120k miles total on the car, averaging 12k/miles year. I changed the oil 10 times (with filter), because 12mo./25k miles is what Mobil recommended in the early years. Car was donated to a race project, it never had any problem involving a lubricated part.
1989 Ford Probe GT
Currently owned, owned since 1989. There are 155k miles on the car, using Mobil 1 for 145k miles. The oil has been changed (with filter), on average, every 8 months. There has never been a problem with any lubricated part, including the turbo. I take no special precautions for the turbo at shutdown.
Neither of these cars have had special care and are/were often started under below freezing conditions.
I am a synethetic oil believer. I also use synthetic in my MB. For me the price of the oil is inconsequential. I like to change my own oil, but I don't want to do it very often.
This is not an argument against using conventional oil, rather it is my successful experience with synthetic.