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Gas: 5W30 synthetic, gasoline-rated oil. Diesel: 5W40 synthetic, diesel-rated oil.
straight 50
15w40
You should immediately drain it out. Diesel oil normally has a higher weight than oil made for gasoline engines. Therefore you may have a lack of lubrication, especially at startup. This can cause premature engine wear.
5w-30 or 5w-40 is what is recommended by VW for use in your Beetle. If it's the 1.9L Diesel, use 5w-40 Diesel oil. Regular oil doesn't have the added detergents etc that this diesel brand does.
Just use a good quality oil that is designed for diesel engines.
Any internal combustion engine will use oil.
That one should be diesel, so any API-CJ4 15W diesel engine oil should suffice.
Typically it should take a 15-40 weight oil. I have a 7.3L and I use the Shell Rottella T 15-40. Very good oil.
15W-40 tends to be a "default" for diesel engines, but your operating environment also affects the ideal oil weight.
NO, do not use diesel oil and a gasoline engine.
The manufacturer recommends that you use 10W-30 weight motor oil in your 2002 BMW 530 diesel. You can use a 10 W-40 weight motor oil in high mileage engines.