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Oil Change precleaners
On my other cars I occasionally add a quart of oil system cleaner before changing the oil. With my 911, there is a lot of oil in the lines and cooler that doesn't drain when you change the oil. If I added a quart of cleaner before the oil change, wouldn't this remain in the system, diluting the new oil?
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John Original owner '81 911SC blackmetallic coupe. Terbatrol, SSI, M+K Gen 4, SC+ cams, A/C delete, console delete, heater backdate, 7 & 8 x 16 Fuchs with polished rims, Turbo tie rods, tensioner update, Rennline engine mount bar, Mainely Custom sump plate, new top-end, corner balance. |
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05-27-2006, 06:14 AM
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Join Date: Apr 2001
Location: Linn County, Oregon
Posts: 48,532
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Good thinking on your part. As far as I know, Porsche has never recommended oil additives.
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"Now, to put a water-cooled engine in the rear and to have a radiator in the front, that's not very intelligent." -Ferry Porsche (PANO, Oct. '73) (I, Paul D. have loved this quote since 1973. It will remain as long as I post here.) |
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05-27-2006, 06:38 AM
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Join Date: May 2001
Location: Peoples Republic of Long Beach, NY
Posts: 21,140
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I'm w/Paul on this one.
I'll use Techron a couple of tanks before my oil change.. that's all.
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Ronin LB '77 911s 2.7 PMO E 8.5 SSI Monty MSD JPI w x6 |
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05-27-2006, 07:09 AM
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Isn't that for fuel system?
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John Original owner '81 911SC blackmetallic coupe. Terbatrol, SSI, M+K Gen 4, SC+ cams, A/C delete, console delete, heater backdate, 7 & 8 x 16 Fuchs with polished rims, Turbo tie rods, tensioner update, Rennline engine mount bar, Mainely Custom sump plate, new top-end, corner balance. |
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05-27-2006, 08:22 AM
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Join Date: Dec 2003
Location: Denver, CO
Posts: 13,324
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Yes it is. But many on this forum feel that it's a good idea to change your oil after you use it as it could change the composition of the oil. Many support that claim by noting how you can smell the techron in the oil after you use it.
as far as flushing your oil system goes, I wouldn't worry much about it. A few minutes of the new oil circulating and it's all the same again.
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1983 SC Coupe 1963 BMW R60/2 1972 Triumph Tiger 1995 Triumph Daytona SuperIII |
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05-27-2006, 09:30 AM
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Here is the problem with engine cleaners. What varnish/sludge it doesn't dislodge completely, it will certainly loosen. So you run the risk of the dislodged junk becoming completely lose and traveling through your oil galleries. I don't know of any car company that recommends any type of oil additive. Some say that full synthetic oil has a cleansing efffect when used the first time. that would be a better way to go.
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The "collection" 1983 911 SC Targa (1 of 1430 imported) 1994 MB E320 Coupe (1 of 825 imported) 1992 MB 190E 2.6 2004 Volvo V70 2.5 Turbo (1 of a bazillion imported) 
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05-27-2006, 05:24 PM
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1981 Porsche 911SC
