Rory's Dad Posted April 27, 2011 Posted April 27, 2011 As above really... Please could anyone tell me what to use instead (or to top up the Castrol Hypoy LS I have at the moment)?? Thanks in advance. Rory's Dad Quote
Dave Eastwood (Gadgetman) - Club Chairman Posted April 27, 2011 Posted April 27, 2011 Ford specify Hypoid gear oil, viscosity SAE 90 to API GL5 for their viscous lsd equiped diff. Lots, and lots available! clicky As for personal preferences, I've always rated the Silkolene oils I've tried, Castrol still have usable alternatives, and will have a direct replacement soon. QUOTE Castrol Hypoy LS 90 This product is now out of stock. Castrol have informed us it will no longer be made. There will be a new replacement in April. You can use B373 but it has no noise suppressant additive. Castrol Hypoy LS is a mineral oil based SAE 90 extreme pressure gear lubricant designed to cope with the special friction characteristics of limited slip differentials and associated hypoid gears. It has been particularly developed for use in limited slip rear axles fitted to high performance cars. This oil should be used where a 90 grade is recommended by manufacturers. A full extreme pressure oil for limited slip differentials fitted to all types of vehicle. (Aston Martin DB7) SAE90 'Course as you don't say what diff/lsd you've actually got, recommending an alternative is a little tricky! Quote
Rory's Dad Posted April 27, 2011 Author Posted April 27, 2011 What type LSD? Sierra (Cosworth?) 7" Rory's Dad Quote
Dave Eastwood (Gadgetman) - Club Chairman Posted April 27, 2011 Posted April 27, 2011 You dont need an LSD oil then. Yes, just a good quality oil to the specs I listed before. Quote
Rory's Dad Posted April 27, 2011 Author Posted April 27, 2011 You dont need an LSD oil then. Why not?? Rory's Dad Quote
Matt Seabrook Posted April 27, 2011 Posted April 27, 2011 Viscous diffs dont need the friction modifiers like plate diffs do. Quote
Dave Eastwood (Gadgetman) - Club Chairman Posted April 27, 2011 Posted April 27, 2011 In a Sierra viscous LSD, the actual LSD module is a factory sealed unit, attached to the crown wheel. The viscous fluid is completely different/separate from the lubricating oil that the diff contains. The actual crown wheel and pinion in a Sierra LSD diff are no different to those in the same ratio open diff, and require the same oil. The oil specs I copied out before are taken directly from the Ford workshop manual by the way. Quote
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