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Check your manual, 30W is reccomended for the Summer. And with todays technology, a 10W40 is ideal in the summer and gives you the benefit of modern viscosity enhancers I am running 20w for that reason Oil presure light is measuing oil pressure... not temperature, and even though the 2 are related you have no idea if the loss of pressure is overheating or a worn or damaged engine. You need to take temperature readings but basically, with a STOCK engine, if the cooling flaps are opening fully, and your cooling ductwork (especially the intake boot) are all intact, and the oil cooler and cylinders are clean its not going to overheat. Keith > but it seems not to be enough,> I ensured all cooling tin is in place and all bolted down, all air intake > hoses and clamps are serviceable and tight. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org