The only difference is on start up, once it's warm they are the same weight. Maybe you should try high mileage oil or add some Prestone oil additives.
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93 GMC Typhoon: new money pit/PITA. Now GT3788R powered.
Boost, because sometimes atmospheric pressure just isn't enough.
"If it has tit's or tires, you can be pretty sure your going to have problems with them..."
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