I have a 2007 Lexus RX 350 with 55K miles. Owned since new. I have been changing the oil with various synthetic 5W-30 oils (Mobil 1, Amsoil, Pennzoil Platinum or Ultra) at 5K intervals as recommended by the dealer. I don't know if this engine is prone to sludge but a flashlight in the oil filler cap show pristine surfaces. The car sees mixed driving with 60% city, 40 % highway.
Think that the oil change interval could be increased to 7.5K? Owners of this engine, or those with experience with it, please chime in.
Think that the oil change interval could be increased to 7.5K? Owners of this engine, or those with experience with it, please chime in.