Posted by charles todd on August 12, 2008 at 16:12:39 from (205.242.95.141):
In Reply to: Synthetic motor oil posted by rustyfarmall on August 12, 2008 at 07:19:38:
I use Mobil 1 5W-20 in my 2001 Silverado, 119,000 miles, change it every 5000 miles. The 2008 Mini Cooper, 12,000 miles, gets Castrol 5W-20 (factory recommended) every 10,000 - 15,000 depending on oil life sensor. This is Mini's PM schedule and they change the oil for 4 years. The 1979 C20 gets Castrol HD30 whenever I think it needs it. Tractors get Castrol Tection 15W-40 dinosaur juice.
Small engines (air cooled) only get SAE 30. Kohler has a disclaimer on their products VOIDING the warranty it Multi-Viscosity oil is used. Experienced this personally with a JD 300 lawn tractor. Rebuilt the Kohler K-frame Industrial and bored engine .010" over. It lasted about 3 years before it started spewing oil out of the carb. The original engine lasted at least 15 years. I fed it Castrol 10W-40 and 20W-50 exclusive.
I think I am going to start using Royal Purple. We have used hyd oil in some hydraulic units and special grease on an automatic grease system in an Industrial Manufacturing Plant. Both assets show less wear than their counterparts and run cooler. My close friend's Step-Grandfather is the chemist that developed the polymer in Royal Purple's recipe many years ago.
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