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I'm hoping you ment a +0.05mm gap? That would be equivalent to a 0.045" gap - nothing to worry about. As plug wear, the gap will open up slightly. Sounds like the plugs need to be changed out.
The NGK BKR6EGP are one step "colder" than the NGK BKR5EGP plugs. The ones that supposed to go in the car are the BKR5EGP. The varying coloration of the plgus are probably due to the mismatched heat range. In some cases, you want to run a colder plug - constant high speed driving, running forced induction, power adders, etc. - for a stock application, stick with the stock heat range plug. Running a plug that is too "cool" for conditions will result in poor sparkplug self cleaning, i.e., the spark plug will have a tendancy to become easily fouled.
As for the owners manual - might be able to download pieces of it online. Best bet is to check eBay or similar. Not sure what the deal with these owner's manual are - even when I bought my Corolla new - it was missing the manual. Dealership ordered one for me, got in the following week - no charge. If I wanted to buy another one - would have run about $18 for the owner's manual.
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2002 Corolla S, 1.8L 1ZZ-FE VVT-i
2003 Matrix XRS, 1.8L 2ZZ-GE, VVTL-i (RIP)
2009 Matrix XRS, 2.4L 2AZ-FE VVT-i
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