I've used Mobil 1 in my cars since it came out in 1976. Mainly because I
worked for Mobil at the time and now because I'm in sales, drive a lot, and
it is nice to change oil only every 25,000 (saves time). Used it in a 77
Datsun 810 for 150,000 and a 89 Volvo 240 for 240,000 miles. No problems
in either car and even at a change interval of 25,000 absolutley zero sludge.
I don't use it in either of the roadsters as they have enough trouble
keeping oil on the correct side of the rear main seal.
Ray
68 1600
68 2000
At 11:11 PM 12/26/1999 -0500, Rob Robinson wrote:
>I've used Mobil1 15w50 in my 2000 since the last overhaul...about 5000
>miles. Changed it every 500 or so. Yeah, seems like overkill, but a
>substantial portion of the run time is spent at full throttle/high rpm, or
>else sitting in my back yard between autocrosses. I just change it twice a
>year.
>
>Yes, I do mean "since overhaul", including break in. The idea that synthetic
>oil is "too slick" to seat rings/bearings etc is not entirely
>correct.Synthetic oil is almost certainly a "slicker" lubricant, and it
>certainly flows better, thus making leaks much more pronounced. I've heard
>many engine builders swear that mineral oil must be used during break
>in...but the funny thing is, many manufacturers deliver new cars with
>synthetic oil installed at the factory. GM, Lotus, and Nissan to name a few.
>(I was told this by a Mobil1 rep who spoke to our local SCCA chapter a few
>years ago, and verified it later in conversations with dealers)
>
>Non-Roadster content below....
>
>I use Mobil1 10w30 at 3k intervals on my '90 Maxima, which is the
>spousemobile/tow vehicle for the roadster or a 17ft boat (140 I/O). The
>Maxima has about 170k now with zero problems other than regular maintenance
>items, and still gets 30mpg highway and 23mpg towing! My daily driver (VW
>Rabbit diesel) has always had Shell Rotella 15w40 at 3k intervals, and after
>about 290k with no engine related problems, it still gets better than 50mpg
>highway. BTW, I tried Mobil1 once in the VW at about 200k, but it used over
>a quart in 500 miles compared with about a pint in 3k with Rotella.
>Needless to say, I switched back.
>
>Rob Robinson
>CSP 67 2000
>Roanoke, VA
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