As a courier I drove my previously owned (used) 2006 Tundra between 150 to 350 miles a day delivering everything from envelopes to over 1,000 lbs of product to people on at-home dialysis.
Timing belts need periodic replacement so I had it done. As the front of the engine is removed to replace the belt replacing the water pump, pulleys, etc. is usually done.
The photos are of the engine block after 255,000 miles and the water pump with half that mileage, using distilled water (no minerals to build-up) and AMSOIL Antifreeze & Engine Coolant (ANT1G-EA), Dominator® Coolant Boost (RDCBCN-EA) .
I use and talk about, but don't sell Amsoil.
Who is shatto?
06 4.7 Tundra replaced a 98 Dakota 3.9.
623,000 miles on original engine and transmission, using Amsoil by-pass filters and lubrication.
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Retired Pro-Hunter featured in; 'African Hunter', by James R. Mellon III. and listed in; Rowland Ward's Records of Big Game.
I suspect that changing it occasionally helps. You know, preventative maintenance like you're doing. Most engines I've seen that have gunk built up either used tap water or hadn't changed the coolant ever on a 15-20+ year old engine.
1991 Toyota Pickup 22R-E 2.4 I4/5 speed
1990 Toyota Cressida 7M-GE 3.0 I6/5-speed manual
mechanic, carpenter, stagehand, rigger, and know-it-all smartass
"You don't get to judge me for how I fix what you break"