Yeah, I wouldn't use a thinner oil. I use 10w40 synthetic with no issues. When do your VLAs tick? Engine hot or cold?

If you're losing oil and it's not leaking or smoking, is it getting in your coolant? <img src="/forums/images/graemlins/scared.gif" alt="" />

'97 Montero 'LSR' - 4.6 gears & factory rear locker, 33" Procomp muds on 15x8 steelies, 50mm coil spacers, T-bar crank, Airlift, sans rear sway, 50mm rear frame & fuel tank lift, Aisins, ARB front bumper + 10k lb winch, 50mm DIY body lift, rock sliders, cut rear quarter panels...