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Posted by Bill Homer [Email] (#3427) [Profile/Gallery] (more from Bill Homer) on Wed, 15 Oct 2003 14:28:42 Share Post by Email
In Reply to: Which of the two oils to buy?!, jani, Wed, 15 Oct 2003 01:32:42
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I assume you are referring to transmission oils.

I had been using the specified 70-weight GL4 gear lube in the transmission of my 1983 900S. My understanding is that this oil is similar viscosity to 10W-30 engine oil, the specified alternative. When I replaced it last fall with 75W-90 gear lube (what could a stinking "5-viscosity points do?"), with similar viscosity to 20W-40, the car was noticeably harder to shift when cold, grinding into second gear the first shift each day. I imagine that 80-weight will be even worse.

Use either 10W30 engine oil or one of the suggested MTLs - however, be forewarned that many people have had catastrophic failures when switching to synthetics - see the archives.

posted by 136.182.2...

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