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Your thoughts on this? #5383710 03/23/20 12:52 PM
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Bill_W Offline OP
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Slick
Re: Your thoughts on this? [Re: Bill_W] #5383732 03/23/20 01:16 PM
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bullwinkle Offline
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If you’re referring to GL-4 vs. GL-5 in manual transmissions/transaxle, it is possible to have a fluid that doesn’t harm anything, but is TOO slippery for the synchronizers to work correctly. I had this issue on my xB with RP 75W90 GL-4/-5, it was sifficult to shift without grinding gears. Straight GL-4 fixed it.


06 Ram 3500 CTD 4X4(FG Venturi), 89 F-450 7.3, 98 XJ 4.0(XG8A), 05 xB(XG3600), 18 Transit 3.7 (MC), 03 Merc Grand Marquis 4.6 2V(XG2), 11 Express 3500 6.0 (Fram PH10060 for now)
Re: Your thoughts on this? [Re: Bill_W] #5383734 03/23/20 01:17 PM
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simple_gifts Offline
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Seriously, meaningful thread titles can help us all


2004 Prius; 131K; ALM
2007 Yaris 108K ATM
2006 B2300;137K;ALM
Re: Your thoughts on this? [Re: Bill_W] #5383756 03/23/20 01:51 PM
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sjd Offline
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So I will weigh in because I'm the one I'm that Bill is trying to argue against.

The argument is this:

Mazda recommends GL-4 fluid in the transmission. Some of us use GL-4/GL-5 recommended fluid for better protection/performance, in my case Motul Gear 300, and a lot of others think we're wrong. I am of the opinion that the quality of the fluid means more than rating. I have used the Motul Gear 300 in my 2010 MX-5, which also called for GL-4, for 120K and 8 years without issue.

Re: Your thoughts on this? [Re: simple_gifts] #5383784 03/23/20 02:28 PM
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Bill_W Offline OP
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Originally Posted by simple_gifts
Seriously, meaningful thread titles can help us all


Will do better next time, you are right.


Slick
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