Can someone tell me if it is better to use mineral or synthetic gearbox / transmission oil in my 03 315R.

Also which brand is best as I can't get the recommended HRC ELF oil.

Edited June 17, 200620 yr by Flash

US Montesa 315R Tips

I had someone post this on another board:

I use GM AutoTrac II transfer case oil in my 315R and 200exc. It's the blue stuff that GM recommends in the NV246 automatic transfer case. It reduces clutch drag and seems to withstand heat much better. So far it doesn't seem to wear the clutch any faster. I would assume that it won't hurt the tranny either since it doesn't hurt the POS GM transfer case.

Silkolene website recommends their Pro SRG 75, sull synthetic ester based oil.

MOTUL Gear 300

Specifically formulated for racing and high performance cars.

Circuit, Group A, Rallye, 4WD and passenger cars.

100% Synthetic - Ester based.

Extreme pressure, anti-wear, anti-corrosion and anti-foam.

For all gearboxes and hypoid rear axles without limited slip systems.

Suitable for all types of fuel: leaded and unleaded gasoline, gasoil, LPG.

Performance Standards: API GL4 and GL5 / MIL-L-2105D

Very high lubricating power which decreases friction and wear.

Very easy gear shifting. Thermal stability under high temperature.

Unshearable oil film, even under extreme working conditions.

Check the Torco oil here:

Tryales Shop - Oils

I have the Elf HTX 740 on order.

Try PJ1 Clutch Tune - I used it in all my 315s and also in my 4RT - no problem in any of them and the clutch doesn't drag.

Try PJ1 Clutch Tuner - I used it in all my 315s and also in my 4RT - no problem in any of them and the clutch doesn't drag.

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I was just going to edit and add that to my post.

The price is right too!

Silkolene, pro SRG 75, AS RECOMMENDED BY SANDIFORDS. You will notice a difference

imo, THE PJ1 doesn't last long

Elf htx740 is also good, but dear at

Silkolene, pro SRG 75,