Quote Originally Posted by vvti2.0 View Post
Sikat ang toyota sa sludge build up, anyway, pa scan mo muna sasakyan mo kung may obd yan. Linisan mo rin ang butterfly ng sasakyan mo.
I have a 23 y.o. Toyota previa that went through three a/c evaporators and 8 sets of tires and never have problem with sludge. Nothing special, I change the engine oil at 7,500 miles or six months. Just keep the engine at operating temperatures and use the right oil ( API SH or higher). Never tamper with the cooling system.