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Heavy duty Spectro Primary oil

awall

Member
Does anyone use the Spectro heavy duty primary oil. I hear alot about the Spector 6 speed oil for the transmision but havn,t seen anything on the primary. Does anyone here use it and recomend it?
 
I do use both Spectro Heavy Duty Primary and Spectro Platinum 6 Speed Tranny oils, no complaints.

Me three, Also use Spectro Platinum 20-50 full synthetic motor oil. There are several good choices out there but Spectro is one of the better ones. If Smitty uses it you know it must be good!
 
I use both spectro gl-5 (platinum 6-speed) in tranny and spectro heavy duty primary. No problems. Just switched primary to spectro from formula + (spectro primary fluid was at metric dealer where I get tranny fluid). I had no complaints about formula + and don't notice a difference with the spectro primary fluid. Just one less stop when I got the spectro tranny fluid.
 
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