How do I flush my motor?

Asked by Aug 26, 2015 at 07:59 PM about the 1969 Volkswagen Beetle

Question type: Maintenance & Repair

Car has been setting in a barn for several years. While draining the oil, several
quarts of clear water came out first then black oil and now grey mix. Plugs are
out and the flywheel will turn. Just wondering if anyone had ever used diesel to
flush  it?

3 Answers


Yes I have used Diesel but I don't recommend it. After you have cleaned out the oil pickup screen, put in a small amount of engine oil in each cylinder and turn it over by hand, then pop off the valve covers and check the valve adjustments and for water in there, replace the gaskets if they are not the good rubber ones, install new Bosch spark plugs, clean the air filter assembly if it still has the old oil bath on it, on the engine flush just use some from a parts store with the oil, but as this is a air cooler only run it half the time listed on the can, drain it all out and clean the oil pickup screen again, refill with fresh oil and drive it about 300 miles or if it starts to get cloudy change it sooner, it may take 2 to 3 oil changes to get it all clean, hopefully that condensation didn't damage any of the wrist pins or crank bearings, but you will find that out once it starts. You better check the gear box before you fire it up also, they can also sweat and have water in there too. When you do finally get it running, flush the brakes, condensation really does a number on these little guys braking systems. HTH

2 of 2 people found this helpful.

Thanks, sounds good. Appreciate your help. Have you ever coated or treated a gas tank?


Yes, I had an old Chevy truck that had an auxiliary fuel tank and when I bought it there was a 1/4 tank of water in the aux tank, I went to a truck shop that had a high pressure steam washer, I washed that thing out for an hour and was still getting rust out of it, so I let it dry then bought some of that black tank sealer, I had to coat it 4 times within the month it was out before I got a good coating that I could see with a light and a mirror, put it in and filled it up and it was good to go it was still working when I sold the truck some 6 years later.

1 of 1 people found this helpful.

Your Answer


Looking for a Used Beetle in your area?

CarGurus has 7,514 nationwide Beetle listings starting at $1,000.


Volkswagen Beetle Experts

  • #1
  • #2
    Chris Billings
  • #3
    Tom Demyan
View All

Related Models For Sale

Used Ford Mustang
696 Great Deals out of 37,617 listings starting at $895
Used Chevrolet Camaro
415 Great Deals out of 30,636 listings starting at $3,550
Used FIAT 500
82 Great Deals out of 6,177 listings starting at $3,535
Used Toyota Corolla
867 Great Deals out of 55,995 listings starting at $1,488

Used Cars For Sale

2017 Volkswagen Beetle For Sale
6 Great Deals out of 2,440 listings starting at $12,995
2016 Volkswagen Beetle For Sale
24 Great Deals out of 422 listings starting at $11,022
2015 Volkswagen Beetle For Sale
30 Great Deals out of 605 listings starting at $8,291
2014 Volkswagen Beetle For Sale
32 Great Deals out of 634 listings starting at $7,500
2013 Volkswagen Beetle For Sale
40 Great Deals out of 690 listings starting at $5,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.