Sounds identical to my LS1, no oil burning, and 13.4 1/4, but me also has sold the V8 (and cold turkey is damn hard), but a diesel is a great option, especially with a tuning box, which i'm sure you'll hear about somewhere on Opelaus!!
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welcome mate, ive just done the opposite to you. sold my astra and I am now back in an LS1. you will miss the note of the V8 tho hehe
both LS1's ive owned dont burn oil and neither does my mates VZ calais LS1.