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Hi Gary great bit of work you've done there .I have used EP90 gear oils ever since i've had old triumphs (which is a few years !) & touch wood never had a problem with bushes or any gearbox problems , i did read that GL 5 is a no no as it contains more of the sulphur additives & that GL 4 is ok as its only at really high temperatures that problems can occur. I forwarded your piece from Morris oil's to the Commando owner & he straight away bought some AG90 & some for me as well !! so a big thank you for all your hard work & it's really good that Morris oils got back to you so quickly they seem to be the good guys . I use their 20w/50 Golden film as i haven't fitted a cartridge filter to my Tiger so a good 'classic' oil is a must .I hope to see your commando at one of the meets soon in the coming year .
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