Originally Posted by Tom K.
OEM BMW branded 5w30 is just over $6.00 per quart. How much will you save using Royal Purple?
I use to be able to buy a 55 gallon drum of 5W-30 for cheap. There wasn't much of a discount on buying cases of quarts thought. I have seen it as high as $9 a quart in some stores.
Originally Posted by Kolyan2k
I call BS. They have many oils ? Which one exactly did engineer NOT recommend ?
XR, HPS, and the regular RP. Remember Royal Purple is from Texas, and one of their offices is here in Houston. We ended up purchasing some of their other products, but when it came to motor oil we stuck with Castrol and Valvoline (for the diesels).
As someone who has dealt with manufacturers including field engineers for warranties and vehicle failures I can tell you that using anything but what the manufacturer says to put in your engine will only create more headaches in the long run.
I used Royal Purple in my race truck, but it saw oil changes after every event.