Royal Purple- good stuff or marketing?
My Bravada transfer case and axles require GM exclusive lubes per GM and they are about 4 times higher than what Wal Mart charges. The two specialty GM lubes are:
Automatic Transfer Case Fluid GM # 12378508
Front and Rear Axle fluid (SAE 80-W90) GM # 1052271.
Especially with the transfer case fluid, GM made a major change in it a few years ago to address chatter in turning wheels at very low speed. Royal Purple lists an equivalent to the GM fluid on their web-site. My question- does it have what the GM fluid has? My quick research directs me to think Royal Purple is a small company and they either have awesome engineers or they are very good at marketing (like the K40 line of automotive electronics in the 1980'* that were crap but sold like crazy because they marketed so good).
Any thoughts on Royal Purple? How can they beat the big engineer budgets of a Mobile or Castrol?
2001 Bonneville SSEi, 219,000 miles.
Whats in my driveway:
1998 Chevy S10 4x4 ZR2, 1999 Olds Bravada, 2001 Pontiac Bonneville SSEi, 2007 Ford F-350 regular cab 2WD, 2008 BMW 335i coupe (Wife'* replacement for her Bonneville). The Bonneville is my favorite of all the cars in the driveway.