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We are talking about 1 liter oil per 400 kilometer (250 miles). Thats abnormal. Previous owner (from '93 till now)of the car told me that the car had always this massive consumption.
Done already: changed PCV valves. Problem wasn't solved.
Did a compressiontest by myself which showed this:
left bank: right bank:
#1 = 12.5 #7 = 13
#2 = 12 #8 = 12.75
#3 = 12 #9 = 13.25
#4 = 12.5 #10 = 13
#5 = 12.25 #11 = 13
#6 = 12.5 #13 = 13
(all in bar)
This test was performed several times. I can't explain the difference between the banks. It seems that #2 and #3 are the weakest of them all, they needed also a few more cranks than the others to reach the highest value.
Spark plugs are looking good, nice white/brown and no deposits, looking all 12 more or less the same.
Detail: some blue clouds are appearing after strong deacceleration and than immediate acceleration (for instance, braking for a red light and light turns green).
Only option left: valve stem seals....is it possible to replace them without lifting the heads? Any advice in this case is greatly appriciated.
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