We just got new XRs for our Formula 382. The place we got them from reccomended Redline heavy duty shock gear synthetic. Engines are 600hp which is right on the edge of what XRs can handle. What is the best gear lube to run? Have also heard that merc drive oil absorbs water, but isnt as good of a lube as some of the others. What have you guys found to be best?

I am running Royal Purple gear oil in my XR/Imco. 725 hp, So far, no oil related issues.

which wt i also run royal purple lightest wt 75 /90 been all good for me also

Im currently with 625sc hp using a 75-140 GL5 full synthetic, but the RP stuff is good to.. Actually Konrad uses it in thier drives.. Jamie / Lakeside


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I run merc stuff, 775 hp in a 30' single, oil is like new when I change it. I was going to switch to Amsoil but I really have no reason to.

where is the best place to get the royal purple stuff?

napa has it in stock

My mechanic met with the royal purple tech rep and they recomended the rp 90 wt syn.

Cheapest way to get royal purple is to buy it form distributor on ebay. You can get a 5 gallon pail or the quart bottles delivered to your doorstep. Cheaper then NAPA. Here is a link. I bought the case for my Konrads


http://cgi.ebay.com/ebaymotors/Royal...spagenameZWDVW

Thats cheaper than Merc HP lube.