A mechanic who only uses Valvoline basically told me to use the maxlife (level two?) Valvoline oil in my 1995 Corolla. It says it's recommended for vehicles with over 75,000 miles. He basically said the standard Valvoline would do practically nothing to protect my car which has 153,000 on it.
Is what he said really true, that as soon as an older vehicle such as this goes beyond 75K that one has to use this maxlife oil? Another mechanic who uses Mobile One never told me anything about an upgraded oil from Mobile other than the synthetic oils, which I am told not to use since this is an older vehicle and to use synthetic oil one has to have used them from the very beginning.
My question is, if using Valvoline, is there a real danger in using the basic oil with 153K on my Corolla?