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Hello Jay I am affraid that you will now have to drain ALL the oil in your engine and refill it with a good quality monograde oil. Also remember that the Volkswagen engine was never designed to use multigrade oil.The reason for NEVER mixing any additive of any sort with the engine oil is because the Volkswagen engine only holds 2.5 litres (4.4 pints imp.).Before the oil passes through the engine it goes through the oil cooler where it is brought to the correct operating temperature, so the engine uses it's oil both as a coolant as well as a lubricant. If you remove part of the oil, say 500 ml. and you replace it with something that isn't oil, you end up with having 20% less oil than you need to effectively lubricate and cool your engine. This may have serious consequences especially in an older engine. To change the engine oil is one of the easiest maintenance jobs on the car. You need a sump gasket kit and a good quality engine oil. When you look at the bottom of the engine you will see a round plate that is held fast by six 10mm nuts and also has a large drain plug 19mm in it's centre. Remove the centre nut and let the old oil drain out. Remove the six smaller nuts and take off the cover plate. Don't worry if some of the studs come out with the smaller nuts, that almost always happens. When the cover is off the oil sieve may be removed if it didn't already fall out. Clean the oil sieve and the cover plate thourghly with petrol or pariffin. Also clean the mating surface on the crankcase with a lintfree rag. With the cover and sieve off, check that the oil suction pipe isn't loose inside the case. Get the two round gaskets out of the sump kit and coat them with a thin layer of clean engine oil. One gasket goes between the oil sieve and the crankcase, the other between the sieve and the cover plate. Replace the six 10mm. nuts and remember to put the new copper washers between them and the cover plate and tighten it evenly. Put the new large copper washer on the sump plug and replace the plug. Do not overtighten the sump plug! Refill the engine from above. Once all the oil is in, wait a few minutes and then start the engine. Check that the oil warning light goes out. Let it idle for a minute or so then shut it off. Wait approx. 5 minutes and check the oil level. Anywhere between the two marks is fine. Hope this helps Regards Adriaan Loedolff adriaan@norton.ctech.ac.za '69 Squareback Automatic (199 400 miles)