Coolant Leak?

[rfcbuf]

1998 GS400 (100k speedo miles) coolant level moved down to low mark on plastic coolant tank since last top off 10,000 miles ago. No visible leakage on floor.Gas gauge registers half as always so the car probably does not overheat.

2 questions: 1.) should I consider that the coolant loss is from a leak or is that a normal occurrence after 10,000 miles since last top off of fluid from dealer?

2.) owners manual specifies 50/50 ethylene glycol based coolant and the coolant I purchased is as manual specifies except that coolant in my car is red and the product purchased is green. Will using the green coolant make any difference?

[silverbullitt]

Well personally I wouldn't worry about it as long as its not leaking or overheating.

[Steve]

never mix green or Red.. if you have red in your car then only use red.