From what I've learned replacing the lifters will only work for a short period of time before it happens all over again. If I recall correctly you might be able to just have them adjusted/ tightened. Also you should prob move up to a 10W-30 or 10W-40 due to your high mileage...
I used to have lifter tick also (with low mileage on the odometer). I tried Lucas as an oil additive instead, and started running 91 octane only in my G, & havent had the problem since. Dont know for sure if thats what fixed it, but its definitely cheaper and worth a shot...
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