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How do you drain the oil on 1970 VW?

Updated: 10/25/2022
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8y ago

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Looking at the center of the underside of your engine, you'll see a round cap approximately four inches in diameter, and usually painted black (the "sump"). Normally, there's a large plug in its center, 17mm if my memory serves me. That's your drain plug. Pull this while the engine is hot to drain the oil.

If it doesn't have the center plug, you'll have to pull the entire sump loose by removing the six 10mm nuts. Make sure you keep track of the copper washers under the nuts. As the sump is removed, you should be able to separate the screen that's sandwiched between two gaskets. Carefully remove all the parts from the six studs hanging from the center cases.

A lot of people will recommend pulling the entire sump at every oil change to clean the screen even if it has the center drain plug, but it's really not necessary. Since it's a pretty course mesh, your engine would probably grenade by the time anything large enough to be caught would show up here.

The best thing you can do for your hair dryer is to install a full-flow spin-on oil filter kit. This has the triple-bonus of keeping your oil much cleaner, adding another quart of oil to the system, and increasing the oil's ability to reject more heat. 'Very important on an air-cooled engine.

Be careful of those "full flow spin on oil filter kits." They work great at cleaning crud out of your oil, especially if you buy the "OEM" one Volkswagen used on Mexican beetles, but if you've got the stock exhaust system on your car they put the oil filter a half-inch from the muffler so your oil gets nice and hot. This can be solved by changing the stock exhaust to something else. You can pick up an "extractor style Volkswagen exhaust system" for around $80 that will do it, or a "megadual" exhaust, "hide-away" exhaust...lots of different exhausts that don't stick the muffler right behind the engine are available.

If you want to get serious about full-flow oil filtering, you should wait until your next rebuild and have your case tapped for full-flow oiling. This will give you a port on the case for oil to come out, and you'll use a replacement oil pump cover to bring it back in. The oil filter will screw into a plate that's bolted to one of your car's frame rails. This is more secure, and you don't have extra weight hanging off your oil pump mounting bolts like you do with the full-flow kits, just sitting there waiting to cause another oil leak.

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