Join Date: Sep 2012
location: Skokie, IL (next to Chicago)
Thanked 1,931 Times in 1,377 Posts
Timing chains can stretch from low oil, and from dirty oil. The proper lubrication is just not there. Chain stretches, tensioners give up, chains can "skip a gear tooth". Since our 4 and 6 cylinder engines are "interference"- it usually causes major engine damage. Timing chains are supposed to last the life of the engine- if oil is changed and always filled- they can go 500,000 miles.
As for the timing belts and water pumps on V6 engines- the time to change the water pump is when you change the timing belt and tensioner.
For water pumps on the 4 cylinder- some on the 7th Gen forum have hit 300,000 miles on the original water pump running Honda long-life coolant with drain and fills at 120,000 miles, and every 5 years after that. Like most water pumps, ours have a "weep hole". If a drop or two of coolant begins to weep out, it is time to change the water pump. This is why it is important to monitor fluid levels.
Some 4 cylinder guys here change it out as preventive maintenance- I don't know at which mileage/time frame as it is not a usual item.
A few months ago- I replaced the weeping, original water pump on my 26 year old Nissan. Changed the alternator, water pump, and accessory belt (3 belts!) while I was there.
As for your preference for dino oil vs. synthetic oil- you seem to suggest that since you change oil at 3,500 miles intervals, dino is more economical. That may be for you- but for me- for the last 5 years I have found synthetic oil (after rebate) to be less expensive than dino oil. A 5 quart jug of synthetic is usually about $9 - $14 after rebate for me. Dino oil is NEVER on sale around here, and is usually $14 and up for 5 quarts. Last month I paid (after rebate) $7 for a 5 quart jug of Quaker State Ultimate Durability Synthetic.....