- Dec 27, 2012
- 04 passat tdi 6spd stage2 webasto TC3 , 04 passatW8 6 spd, 10 Jetta TDI 6spd stage 1
That 5w30 has less film strength than 5w40 is a widely believed conception that is false. I had to learn this the hard way years ago .5W-30 has a lower film strength than 5W-40 and thus causes a flat tappet cam wear faster. Even the older VE engines had cam wear issues on 5W-30 and the narrow PD lobes just make it even worse.
Bottom line is you can run what you like in your car but 5W-30 has killed a lot of PD cams. Even your owner's manual states to use 5W-40 if possible.