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A few comments, based on over 25 years of using and selling AMSOIL synthetics:
>>>They were developed because they are more resistant to breakdown
That is probably the very best reason to use synthetics. About every other reason is just a bonus.
>>In the same light GM started recommending 5W30 weight back in the seventies in order to squeeze an extra 0.5 mpg out of their fleet average, engine wear be hanged
Actually. it had more to do with the ring problems created when the viscosity improvers sheared with use in the 10W-40s. And the recommended viscosities for most of them were 10W-30. 5W-30 came later--and the oils were better, and xW-30 is all within the same viscosity range at operating temperature.
>>>For my money if you are going to change the oil every 5000 miles one might as well use a good dino oil preferably from Pennsylvania crude.
Nice thing about this country is that everyone is entitled to his or her own opinion. Might be hard to find much Pennsylvania crude these days, tho.
>>>Also, most any additive detracts from lubricating qualities of the oil. Note that Briggs and Stratton recommends against using multigrade oils in their lawnmower engines.
Not sure I understand the first part of the comment, but B&S (several years back) approved the use of multigrades, and specifically recommends synthetics (their testing showed reduced wear, better performance)
>>>I have had Saabs for over 20 years and have used nothing but 10W30 Wolf's Head oil. So far, with the exception of the main oil seal being replaced in one at 220,000 miles, none of the engines or turbos have been worked on and none have required additional oil between changes
Goes to show that good maintenance can make equipment last a long time.
I've had Saabs for over 34 years, and have used AMSOIL since I found out about it. All were bought used--some used some oil between changes (but changes were yearly/25,000 in non-turbos and yearly/10,000 in turbos.
Some years back, BMW ran a test, using Mobil 1 5W-30 oils. After over 1,000,000 miles (dyno simulation of real-life driving), using normal oil change intervals, there was no measurable wear on the engine parts--everything was within factory specs.
Additionally, the engine will run cooler, normally one will see a bit better fuel economy (or more power), better protection in case of a mechanical problem, capability of safely extending drain intervals.
It's good enough me!!
posted by 70.21.46...
, Sun, 5 Dec 2004 07:06:05
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