manual transmission fluid

[luke]

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ive got a 90 5 speed manual which calls for synthetic 75w90 GL-4...
i found some cheap mineral 80w90 which also meets GL-4.
anyone ever tried this?
only reason is th mineral stuff is $3.50/L
and synthetic is $9.50/L
id much rather pay $10 than $30

luke
90tq with a working engine tomorrow :)
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