RP 5w/30, 2003 MINI Cooper S, 25K, 251K

Messages
6,925
Location
NH
Wow. 25K from RP is really stretching it. 12-15K is what the oil was designed to do and is marketed for by the company. Great report on such a long OCI.
 
Messages
23,697
Location
Dallas,Tx USA
My 3200/3 month oci on RP had a perfect uoa. No wear metals whatsoever,and it was all super-short back and forth to work trips every day,and daily wot runs. As to the value,it`s actually the cheapest genuine synthetic oil you can buy. Even at $8.99 a quart,it`s a buck or two cheaper than the other common,easy to get synthetics,and I`m talking about grp IV and higher,not grp III dinos.
 
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Messages
244
Location
OHIO
i emailed them about the HTHS of some of their oils: The values for those three RP Oil formulations are listed below with the minimum standard value for that motor oil viscosity shown in parentheses: RP SAE 0W-40 3.6 (2.9) RP SAE 5W-40 3.5 (2.9) RP SAE 10W-30 3.37 (2.9)
 
Messages
8,756
Location
RI
Originally Posted By: Hoosier_Daddy
RP SAE 0W-40 3.6 (2.9) RP SAE 5W-40 3.5 (2.9) RP SAE 10W-30 3.37 (2.9)
Good needed data! 25k? Remind me never to buy a used '03 Cooper S! BTW, divide the mileage/5 and the wear/5 and this UOA shows that you can still 'recommend' or use RoyalPurple. Mobil1 HTHS 0w40 is 3.8! RP is 3.6. Cold MRV is better with RP. RP might be a better choice for someone that wants to go thicker but not too thick. All oils shear and then thicken up. I have little faith in insolubles to show that. Oxidation/nitration would be interesting(different lab needed). TBN/TAN would be a must if you plan on doing this often. But, 25k/8months screams much highway commuting which is low 'time' on the oil compared to 25k of traffic ;-) 1.5 quarts in top off helps. What is the sump capacity? What filter was used?
 
Messages
10,146
Location
Burlington, Ontario, Canada
The RP 5W-40's HTHS vis of only 3.5cP doesn't seem right. It shouldn't be lighter than their own 0W-40 particularly with a higher KV100 of 15.7cSt vs 14.3cSt. If anyone was considering this oil I'd double check that figure. 3.5cP is he spec' for a heavy 30wt like GC not a 40wt oil.
 

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Messages
45,332
Location
Ontario, Canada
Great report, but a TBN/TAN would have been very useful to see just how far you could have run this and how close to the limit you were.
 
Messages
746
Location
Northern Michigan
Until I moved to the middle of nowhere most of my driving was stop and go in the city. At best I'd get 35-40,000 miles out of a set of brakes and shocks/struts (the roads were and still are riddled with potholes from all the traffic). Now I travel long distances on paved 2 lane highways most of the time at 60-65 mph (mostly 55 mph speed limit here). I'm driving 35-40,000 miles per year. Wear on the vehicles (particularly brakes and suspensions) is practically nil with that kind of driving. Now if I could find a place to buy a pair of shoes...
 
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