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Registered
Join Date: Jan 2004
Location: Northern Virginia
Posts: 3,347
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Well.. you've already read the owners manual and saw that 10-30 is an acceptable oil.
Stop worrying then!
imho, 20-50 is for HOT temps or track use.. Same with 15-50. 10-40 is a fine year round oil. Not sure I would run 10-30 in the heat of summer though. But since, given your limited use, you might plan on changing oil twice a year (spring and fall) you can worry about replacing the 10-30 in the spring.
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1970 914-6
Past:
2000 Boxster 2.7, 1987 944, 1987 924S
1978 911SC, 1976 914 2.0, 1970 914 w/2056
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