What is the best engine oil for the Porsche Boxster & what is the best gas additive boost to use & freguency ?
It should say in the manual what type of oil porsche recommends. It's probably a synthetic. I have heard only good things about royal purple, but you really can't go wrong with any oil out there. They are pretty much the same. Just make sure you use the correct weight. As for additives a fuel injector cleaner can be used once in a while, like once a year. You don't need to use an octane booster unless you are messing with the timing at all. The engine is tuned to run on the octane they specify in the manual.
Mobil 1 is quickly turning to junk. They're eliminating zinc and phosphate from the oil. This will prevent burnt oil from ruining the catalytic converter, which helps emissions. Trouble is that zinc and phosphate are important in preventing engine wear. They've lost an important oil service classification (what oil is right for what application). I'll be looking elsewhere for oil when I change it in my Porsche this spring. I would recommend looking into Redline engine oil. Check your manual for the specified grade (I know that older Porsches love thick oil, like a 20-50 in summer, not sure on the new stuff.) No affiliation, but their transmission oil worked wonders in my car. It's a little more expensive than Mobil 1, though, and you can't find it anywhere. You'll likely need to mail-order. Gas additive- only Chevron Techron injector cleaner. Anything else is snake oil. Additives are not magic. Even Techron doesn't prevent the need to pull and clean injectors at a major service. It's more important to use the recommended octane gasoline, as that will prevent detonation (fuel igniting before it should) and permit your engine to make full power.
Mobil 1 5W-30. Change oil and filter every 3000 miles. Do not use any fuel additives. Purchase fuel from Amoco/BP, Shell, Mobil or Phillips 66 because their fuels are already set to maximize your vehicle's performance. Do not buy from discount gasoline stations.
